Lawn-mower sharpener.



c. E. RING. LAWN MOWER SHARPBNER.

APPLICATION FILED NOV. 19. 1912.

1,071,580, Patented Aug. 26, 1913.

2 SHEETS-SHEET l.

WTIVESSES IWE N TOI? /17TORIVEYS C. E. RING.

LAWN MOWER SHARPENER.

APPLICATION FILED 11017.19, 1912.

Patented Aug. 26, 1913.

2 SHEETS-SHEET 2.

W/TNESSES Y ATTHNEYS soA CHARLES E. RING, OF BEDFORD CITY, VIRGINIA, ASSIGNOR 0F THREEFFGURTHS T0 A JAMES MCINTYRE, JOHN PITTS, AN'D CHARLES, L. MOSBY 0F BEDFORD CITY, VIR- ernia.

EAWNS-MOWEB. SHARPEN-ER.

Specification, of! Letters Patent.

Patented Aug. 26, 1913'.

To. allrwm L may concern Be it known that I, CHARLES E. Rind, a citizen of the United States, and a residen-t o Bedford City-, in the county oai Bedford and State o Virginia., have. invented a new and Improved Lawn-Mower Sharpener, ot which the following is a full, clear, and exact description.

This invention relates te Sharpeners, for 10 lawn mowers, and has reference more particularly to the class. which comprises a support carrying a sharpening stone slidablyl mounted om the lawn mower trame when desired to sharpen the mowing knives. l5 An object of the invention is to provide an. inexpensive, simple and reliable sharp ener by means. oi which the rotating knives can. be properly sharpened with referene to the stationary lmife, and in which the sharp- 2 0 gi@ stone is guided by the stationary l e.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar` characters. of reference indicate corresponding parts in all the views.

Eigure 1 is. a cro .section through an verted lawn mower in. position for sharp-A f eningv the knives, Provided with an embodiment of my invention for the saine; Fig, 2 is a section on the line 2-.-.2 o'l F1 3,; Eig.

3 is a plan view on Fig., 1; and ig, 4 is. a

section on the line 4-4 of Fig.y 3, J

Referring to the drawings, 10 represents the main body of the Sharpener carrying near one. end the sharpening stone 11, `for which an aperture 12, similar to. the cross section of the stone, is provided, and is preferably of angular form,` A slit 13, 1s

the aperture 12, so that by means of a stud bolt 14, positioned across `the slit, the stone 11 is secured or clamped in the aperture 12 of the body. Adjacent to the stone l1, cen- 45 tral and parallel with the same, at theI .o.p.

formed in the end of the body 10 leading to centrally with the body l0 and in the longi- Atv the opposite. end of the body 10, running longitudinally of same, a rectangular Slot 2Q is provided, in which a bearing block 211 is mounted; The block 21 is positioned tudinal axis of the body. It is provided at one end' with a rod 22 projecting through the end oi the body 10v and threaded into the same. 'Ehe` end-j of the rod 22 engaging the :block 2 1 is provided with .a groove 23 so 615 that a. 24, positioned in the block 21,

lprevents vthe longitudinal displacement of -the rod. independent of the block,A while it permits the rotation of the threaded rod 22 by means o the. square head 25 provided '10 at the end opposite. the-grooved end. The

end of the block 21 opposite the one having the threaded rod,in v the same axial line, is 'provided with a rod 26 ti-Xed in any suitable way in the body of the block 21, andit Z5 is guided'by a hole. 27 formed in the body 10 so. thatwhen the bearing block 21 is Imoved longitudinally in the slot 20 of the 1 main body 10. by means of the threaded rod l22j, the. rod 26 positioned at the opposite end of the bearing block 21 moves in the hole 27.

The bearing block 21,s centrally and normally to the longitudinal axis of the main body 1.0 is provided with a block 21 is provided with grooves through which a rod 9. projects. The orifice 28, 'near its ends 1 which opens intoori-iice 23 is provided with grooves.

fitted, forming a. bearing for. the rod 29. Q9 y 0 into` which a number of balls are The. balls 30. are placed in position after i the rod 29 is projected through by removing a screw threaded into4 thebody of the bear- :ing block 2,1 registering with the grooves,

ries of apertures 32 by meansof which the not shown in the drawing. The rod 29 running transversely and normally to the longitudinal axis of the mai-n body 10. is in length equal t0 the width of the frame of the lawn ymower for which the Sharpener is intended, and on said rod 29 plates 31 are 190 .provided at each side of' the vbearing block 21,.v and are adapted to engageA the frame of the lawn mower. The plates 31 have a sesame can besecnred to the frame of the 195 lawn mower. For different widths of lawn mowers, the. rod 29 will be oiy different j length to fit in the place of the wooden rollerer@ e be sharpened.

which is removed when the' rotating knives To sharpen the rotating knives in a lawn mower, the same is inverted, the wooden roller of the lawn mower is removed from the guideways 34 by simply disengaging the bolts 33 by means of which the same is attached to the sides of the frame of the lawn mower, and the plates 31 are then fitted into the guideway 34 of the frame of the lawn mower and secured thereto by means of the bolts 33 engaging the orifices 32. Thereby the plates 31 support the rod 29 and the Sharpener mounted on the rod 29. The main body 10 is so placed that the sharpening stone 11 is over-the rotating knife, with the block 17 resting upon the stationary knife 35 attached to the cross piece 36 of the frame of the lawn mower, (see Fig. 1). By turning the threaded rod 22, t-he main body 10 is moved so as to bring the sharpening stone 11 substantially over the axis of rotation of the rotating blades. rlhe amount of sharpening is regulated by screwing in or out of the bolt 15, which raises or lowers the main body 10 as the block 17 is forced against the stationary blade 35, the main body rotating about the rod 29 as a center when the bolt 15 is screwed in or out. lVhen the Sharpener is properly positioned over the rotating blades 37 to sharpen the same, the blades 37 are revolved through the medium of the 4wheel 40 actuated by the crank arm 41, and by reciprocating the' Sharpener on the rod 29 simultaneously with the rotation of the blades, the same are sharpened. To rotate the wheel 40 when the lawn mower is inverted for sharpening the knives, I provide a crank arm 41 attached to the wheel 40 by means of set screws 42.

The knives 37 being set in rotation by the rotation of the crank 41, the main body 10 of the Sharpener is then reciprocated on the rod 29 to and fro from one end to another, thereby coming in contact uniformly with the edges of the knife through its entire lengt-h, the Sharpener being guided by the stationary knife, that is, having the same contact at one end as at the other. To prevent the displacement of the rod 29 in the plates 31, pins 31 are provided at each end of the rod 29 projecting through the plates 31. l f It can be easily seen that with my sharpener, the rotating knives are uniformly sharpened so as to form a perfect cylinder and thereby, when cutting in reference to the stationary knife, they will always form the same clearance with said stationary knife, and therefore will cut the grass uniformly.

While my device is described in connection with a lawn mower, and primarily intended for same, it can be used, as can bev easily seen, with any mechanism including a rotating knife.

Having thus described my invention1 I imitan claim as new and desire to secure by Letters Patent- 1. 1n a device of the class described for use with mechanism including 'a rotating knife, a detachable support parallel to the axis of rotation of theknife, a block adapted to reciprocate longitudinally thereof, a carrier having a slot receiving the said block, means in said carrier on said block whereby said carrier may be reciprocated perpendieularly to said support on said block and transversely with said block, and a sharpening element on said carrier.

2. A device of the class described, for use with mechanism including a rotating knife, comprising a detachable support on the mechanism parallel to the axis of rotation of the knife, a longitudinal carrier transversely mounted on said support, and adapted to reciprocate on the same, a sharpening element adjustably mounted in said carrier normal to the axis of rotation of the knife, adjustable means in said carrier coacting with said support whereby said carrier can be translated perpendicularly to said support and thereby translating said sharpening element with respect to the axis of rotation of the knife, and means adjacent to said sharpening element in said carrier eo-acting with a member of the mechanism whereby the amount of sharpening of said knife is limited, and made uniform through the length of the lmife.

3. A device of the class described for use with mechanism including a rotating knife, comprising a detachable support on the mechanism parallel to the axis of rotation of the knife, a longitudinal carrier transversely mounted on said support and adapted to reciprocate longitudinally thereof, said carrier having a slot, a block slidably mount- .ed in said slot and engaging said support,

means associated with said block and carrier whereby said carrier may be translated in a direction normal to said support, a sharpening element in said carrier, means for adjusting the same in said carrier, and adjustable means adjacent to said sharpenin element in said carrier and co-acting witg said mechanism, whereby said carrier can be raised or lowered with reference to the axis of rotation of the knives on the said l port, a, sharpenin element"I said carrier erenoe to the axis'of rotation of the miie on normal to same an to said support on which the said support as a pivot. said carrier is mounted, means for adjusting In testimony whereof, I have signed my the said sharpening element in lsaid carrier, vneme to this specification in the presence of 5 a bolt threaded 'm slslid carrier aldjaoent ang two subscribing Witnesses. v

. arallel to said s arpenin e ement an l entral with it,` and a blockgassooiated with CHARLES E' RING' said bolt and said carrier whereby said block Witnesses: co-acts with the mechanism and whereby the C. N. CRAWFORD, l'carrier may be raised or lowered with ref- F. P. GRAVES.

1,071,5eo i 

